mirror of
https://github.com/VCMP-SqMod/SqMod.git
synced 2024-11-09 01:07:16 +01:00
580 lines
20 KiB
C++
580 lines
20 KiB
C++
#ifndef _SQSQLITE_CONNECTION_HPP_
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#define _SQSQLITE_CONNECTION_HPP_
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// ------------------------------------------------------------------------------------------------
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#include "Common.hpp"
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#include "SqAPI.h"
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// ------------------------------------------------------------------------------------------------
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namespace SqMod {
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/* ------------------------------------------------------------------------------------------------
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* Class used to manage a connection to an SQLite database.
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*/
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class Connection
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{
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protected:
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/* --------------------------------------------------------------------------------------------
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* Create the database connection resource.
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*/
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void Create(CSStr name, Int32 flags, CSStr vfs);
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/* --------------------------------------------------------------------------------------------
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* Validate the document reference and throw an error if invalid.
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*/
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void Validate() const;
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private:
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// --------------------------------------------------------------------------------------------
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ConnHnd m_Handle; /* The handle to the managed database connection resource. */
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public:
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/* --------------------------------------------------------------------------------------------
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* Attempt to open the specified database.
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*/
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Connection();
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/* --------------------------------------------------------------------------------------------
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* Explicit constructor.
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*/
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Connection(CSStr name);
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/* --------------------------------------------------------------------------------------------
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* Explicit constructor.
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*/
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Connection(CSStr name, Int32 flags);
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/* --------------------------------------------------------------------------------------------
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* Explicit constructor.
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*/
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Connection(CSStr name, Int32 flags, CSStr vfs);
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/* --------------------------------------------------------------------------------------------
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* Direct handle constructor.
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*/
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Connection(const ConnHnd & h)
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: m_Handle(h)
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{
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/* ... */
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}
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/* --------------------------------------------------------------------------------------------
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* Copy constructor.
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*/
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Connection(const Connection & o)
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: m_Handle(o.m_Handle)
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{
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/* ... */
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}
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/* --------------------------------------------------------------------------------------------
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* Destructor.
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*/
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~Connection()
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{
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/* Let the reference manager destroy the connection when necessary. */
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}
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/* --------------------------------------------------------------------------------------------
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* Copy assignment operator.
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*/
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Connection & operator = (const Connection & o)
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{
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m_Handle = o.m_Handle;
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return *this;
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}
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/* --------------------------------------------------------------------------------------------
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* Perform an equality comparison between two connections.
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*/
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bool operator == (const Connection & o) const
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{
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return (m_Handle == o.m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* Perform an inequality comparison between two connections.
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*/
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bool operator != (const Connection & o) const
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{
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return (m_Handle != o.m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* Implicit conversion to the raw connection handle.
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*/
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operator sqlite3 * ()
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{
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return m_Handle;
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}
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/* --------------------------------------------------------------------------------------------
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* Implicit conversion to the raw connection handle.
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*/
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operator sqlite3 * () const
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{
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return m_Handle;
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}
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/* --------------------------------------------------------------------------------------------
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* Used by the script engine to compare two instances of this type.
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*/
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Int32 Cmp(const Connection & o) const
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{
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if (m_Handle == m_Handle)
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return 0;
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else if (m_Handle.m_Hnd > o.m_Handle.m_Hnd)
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return 1;
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else
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return -1;
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}
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/* --------------------------------------------------------------------------------------------
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* Used by the script engine to convert an instance of this type to a string.
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*/
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CSStr ToString() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mName.c_str();
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}
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/* --------------------------------------------------------------------------------------------
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* Used by the script engine to retrieve the name from instances of this type.
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*/
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static SQInteger Typename(HSQUIRRELVM vm);
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/* --------------------------------------------------------------------------------------------
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* See whether this connection is valid.
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*/
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bool IsValid() const
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{
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return m_Handle;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the associated connection handle.
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*/
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const ConnHnd & GetHandle() const
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{
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return m_Handle;
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}
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/* --------------------------------------------------------------------------------------------
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* Return the number of active references to this connection handle.
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*/
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Uint32 GetRefCount() const
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{
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return m_Handle.Count();
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}
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/* --------------------------------------------------------------------------------------------
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* Release the reference to the associated database connection.
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*/
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void Release()
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{
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m_Handle.Drop();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the last received status code.
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*/
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Int32 GetStatus() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mStatus;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the flags used to create this database connection.
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*/
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Int32 GetFlags() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mFlags;
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the name used to create this database connection.
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*/
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CSStr GetName() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mName.c_str();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the virtual file system used to create this database connection.
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*/
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CSStr GetVFS() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mVFS.c_str();
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}
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/* --------------------------------------------------------------------------------------------
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* Return the numeric result code for the most recent failed API call (if any).
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*/
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Int32 GetErrorCode() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle.ErrNo();
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}
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/* --------------------------------------------------------------------------------------------
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* Return the extended numeric result code for the most recent failed API call (if any).
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*/
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Int32 GetExtendedErrorCode() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle.ExErrNo();
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}
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/* --------------------------------------------------------------------------------------------
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* Retrieve the message of the last received error code.
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*/
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CSStr GetErrStr() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle.ErrStr();
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}
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/* --------------------------------------------------------------------------------------------
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* Return the last error message associated with this database connection.
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*/
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CSStr GetErrMsg() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle.ErrMsg();
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}
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/* --------------------------------------------------------------------------------------------
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* Attempt to open the specified database.
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*/
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void Open(CSStr name)
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{
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if (m_Handle.m_Hnd)
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m_Handle->Create(name, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL);
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}
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/* --------------------------------------------------------------------------------------------
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* Attempt to open the specified database.
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*/
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void Open(CSStr name, Int32 flags)
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{
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if (m_Handle.m_Hnd)
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m_Handle->Create(name, flags, NULL);
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}
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/* --------------------------------------------------------------------------------------------
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* Attempt to open the specified database.
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*/
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void Open(CSStr name, Int32 flags, CSStr vfs)
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{
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if (m_Handle.m_Hnd)
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m_Handle->Create(name, flags, vfs);
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}
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/* --------------------------------------------------------------------------------------------
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* Attempt to execute the specified query.
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*/
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Int32 Exec(CSStr str);
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/* --------------------------------------------------------------------------------------------
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* Attempt to queue the specified query.
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*/
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void Queue(CSStr str);
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/* --------------------------------------------------------------------------------------------
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* Attempt to create a statement from the specified query.
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*/
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Object Query(CSStr str) const;
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/* --------------------------------------------------------------------------------------------
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* See if the database connection was opened in read-only mode.
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*/
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bool IsReadOnly() const;
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/* --------------------------------------------------------------------------------------------
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* Shortcut to test if a table exists.
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*/
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bool TableExists(CCStr name) const;
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/* --------------------------------------------------------------------------------------------
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* See if the database connection is or is not in auto-commit mode.
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*/
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bool GetAutoCommit() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return sqlite3_get_autocommit(m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* Get the row-id of the most recent successful INSERT into the database from the current connection.
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*/
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Object GetLastInsertRowID() const;
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/* --------------------------------------------------------------------------------------------
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* Returns the number of database rows that were changed, inserted or deleted
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* by the most recently completed SQL statement.
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*/
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Int32 GetChanges() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return sqlite3_changes(m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* Returns the total number of row changes caused by INSERT, UPDATE or DELETE statements
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* since the database connection was opened.
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*/
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Int32 GetTotalChanges() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return sqlite3_total_changes(m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* See if this database connection has tracing enabled.
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*/
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bool GetTracing() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mTrace;
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}
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/* --------------------------------------------------------------------------------------------
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* Activate or deactivate tracing on this database connection.
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*/
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void SetTracing(bool toggle)
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{
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// Validate the handle
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Validate();
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// Check whether changes are necessary
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if (m_Handle->mTrace == toggle)
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return; /* No point in proceeding */
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// Do we have to disable it?
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else if (m_Handle->mTrace)
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sqlite3_trace(m_Handle, NULL, NULL);
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// Go ahead and enable tracing
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else
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sqlite3_trace(m_Handle, &Connection::TraceOutput, NULL);
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}
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/* --------------------------------------------------------------------------------------------
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* See if this database connection has profiling enabled.
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*/
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bool GetProfiling() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return m_Handle->mProfile;
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}
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/* --------------------------------------------------------------------------------------------
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* Activate or deactivate profiling on this database connection.
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*/
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void SetProfiling(bool toggle)
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{
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// Validate the handle
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Validate();
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// Check whether changes are necessary
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if (m_Handle->mProfile == toggle)
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return; /* No point in proceeding */
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// Do we have to disable it?
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else if (m_Handle->mProfile)
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sqlite3_profile(m_Handle, NULL, NULL);
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// Go ahead and enable profiling
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else
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sqlite3_profile(m_Handle, &Connection::ProfileOutput, NULL);
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}
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/* --------------------------------------------------------------------------------------------
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* Set a busy handler that sleeps for a specified amount of time when a table is locked.
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*/
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void SetBusyTimeout(Int32 millis);
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/* --------------------------------------------------------------------------------------------
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* Causes any pending database operation to abort and return at its earliest opportunity.
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*/
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void InterruptOperation() const
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{
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// Validate the handle
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Validate();
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// Perform the requested action
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sqlite3_interrupt(m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* Attempts to free as much heap memory as possible from the database connection.
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*/
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void ReleaseMemory() const
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{
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// Validate the handle
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Validate();
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// Perform the requested action
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sqlite3_db_release_memory(m_Handle);
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}
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/* --------------------------------------------------------------------------------------------
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* Move the whole database into memory.
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*/
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Connection CopyToMemory();
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/* --------------------------------------------------------------------------------------------
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* Takes a snapshot of a database which is located in memory and saves it to a database file.
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*/
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void CopyToDatabase(const Connection & db);
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/* --------------------------------------------------------------------------------------------
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* Returns internal runtime status information associated with the current database connection.
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*/
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Int32 GetInfo(Int32 operation)
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{
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return GetInfo(operation, false, false);
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}
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/* --------------------------------------------------------------------------------------------
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* Returns internal runtime status information associated with the current database connection.
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*/
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Int32 GetInfo(Int32 operation, bool highwater = false)
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{
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return GetInfo(operation, highwater, false);
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}
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/* --------------------------------------------------------------------------------------------
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* Returns internal runtime status information associated with the current database connection.
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*/
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Int32 GetInfo(Int32 operation, bool highwater = false, bool reset = false);
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/* --------------------------------------------------------------------------------------------
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* Retrieve the number of queries in the queue.
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*/
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Uint32 QueueSize() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return (Uint32)m_Handle->mQueue.size();
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}
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/* --------------------------------------------------------------------------------------------
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* Remove all queries from the queue without executing them.
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*/
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void ClearQueue() const
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{
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// Validate the handle
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Validate();
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// Return the requested information
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m_Handle->mQueue.clear();
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}
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/* --------------------------------------------------------------------------------------------
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* Remove the last query from the queue.
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*/
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void PopQueue() const
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{
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// Validate the handle
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Validate();
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// Perform the requested action
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if (!m_Handle->mQueue.empty())
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m_Handle->mQueue.pop_back();
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}
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/* --------------------------------------------------------------------------------------------
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* Flush all queries from the queue.
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*/
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Int32 Flush()
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{
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// Validate the handle
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Validate();
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// Return the requested information
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return Flush(m_Handle->mQueue.size());
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}
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/* --------------------------------------------------------------------------------------------
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* Flush a specific amount of queries from the queue.
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*/
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Int32 Flush(Uint32 num);
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/* --------------------------------------------------------------------------------------------
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* Flush a specific amount of queries from the queue.
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*/
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Int32 Flush(Uint32 num, Object & env, Function & func);
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/* --------------------------------------------------------------------------------------------
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* Attempt to execute the specified query.
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*/
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static SQInteger ExecF(HSQUIRRELVM vm);
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/* --------------------------------------------------------------------------------------------
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* Attempt to queue the specified query.
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*/
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static SQInteger QueueF(HSQUIRRELVM vm);
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/* --------------------------------------------------------------------------------------------
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* Attempt to create a statement from the specified query.
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*/
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static SQInteger QueryF(HSQUIRRELVM vm);
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protected:
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/* --------------------------------------------------------------------------------------------
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* Callback function for ActivateTracing()
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*/
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static void TraceOutput(void * ptr, const char * sql);
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/* --------------------------------------------------------------------------------------------
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* Callback function for ActivateProfiling()
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*/
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static void ProfileOutput(void * ptr, const char * sql, sqlite3_uint64 time);
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/* --------------------------------------------------------------------------------------------
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* Build and modify the structure of tables and other objects in the memory database.
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*/
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static int ProcessDDLRow(void * db, int columns_count, char ** values, char ** columns);
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/* --------------------------------------------------------------------------------------------
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* Insert all data from the origin database into the memory database.
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*/
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static int ProcessDMLRow(void * db, int columns_count, char ** values, char ** columns);
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/* --------------------------------------------------------------------------------------------
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* Takes and saves a snapshot of the memory database in a file.
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*/
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void TakeSnapshot(const ConnHnd & destination);
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};
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} // Namespace:: SqMod
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#endif // _SQSQLITE_CONNECTION_HPP_
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